Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecc20732da6ddfe6…

MALICIOUS

PDF

36.1 KB Created: 2021-07-03 15:45:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 00ea3bf9dea604c7cf98b8f098f3aaf0 SHA-1: 83c8ea4a93ded6f580d8ed209d346dc2690b967c SHA-256: ecc20732da6ddfe60d453c0e5c97d160e43580691b68d2d2dfc8efc2f07086f4
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://netcdn.tw/app/406889139/free-coin-master-hacks-game-hack PDF link annotation
    • http://lib.fisipumt.ac.id/repository/how-to-tiktok-hands-free_GM835599320.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/roblox-play-for-free-login_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/roblox-hacks-and-cheats_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/aimbot-hacks-for-roblox_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/hack-to-send-gold-cards-on-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-to-hack-a-private-server-roblox_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/coin-master-free-spins-and-coins-today-gift-reward_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-to-get-roblox-for-free-on-pc_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/roblox-sexually-abused_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/mcpe-master-unlimited-coins-hack-apk_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/minecraft-launcher-free_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/roblox-earn_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-robux-hacker-us_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/coin-master-free-spins-link-facebook_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/coin-master-free-online-game_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/lastrick-com-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/www-roblox-hack-top_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/5-ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-to-do-the-frog-hack-in-roblox_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00003676.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3676 23216 bytes
SHA-256: 8d926f69eeaa2bf06164f367783e93d6f41fea04d60fe08840482f63b26ea288
font_01_sfnt_off00006ad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AD2 18168 bytes
SHA-256: 0b2a96827142e2704bc3cf92debab539c74e7a066f59150f0464612b64e0e13f

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